Thanks for posting in the Tableau Community. Can you verify the command was run as outlined in the following document, quoted below, Security Hardening Checklist - Tableau
The following tsm command enables TLS v1.2 (using the "all" parameter) and disables SSL v2, SSL v3, TLS v1, and TLS v1.1 (by prepending the minus [-] character to a given protocol).
tsm configuration set -k ssl.protocols -v 'all -SSLv2 -SSLv3 -TLSv1 -TLSv1.1'
tsm pending-changes apply
pending-changes applycommand displays a prompt to let you know this will restart Tableau Server if the server is running. The prompt displays even if the server is stopped, but in that case there is no restart. You can suppress the prompt using the
--ignore-promptoption, but this does not change the restart behavior. For more information, see tsm pending-changes apply.
I would verify that you leverage single quotes in the command and not double when listing out the protocols.
Hope this helps!